`5` Would you mind 

`-` Would you mind + V-ing ? 

`-` would like + to V

`6` Old car tires are recycled to make shoes and sandals 

`-` Chủ động thì Hiện Tại Đơn : S + V(s/es) + O 

`-` Bị động thì Hiện Tại Đơn : S + is/am/are + Vpp + ( by O ) 

`-` Old car tired là số nhiều `->` chia are

`7` The boy who is my uncle , is playing chess with you 

`-` Mệnh đề quan hệ "who" : thay thế cho danh từ chỉ người , làm chủ ngữ 

`8` It's very important to keep the environment clean 

`-` It's + adj + (for sb) + to V

`-` V-ing + ... + is + adj 

5. I would like you to help me to put the chairs away.

→ Would you mind helping me put the chairs away?

6. People recycle old car tires to make shoes and sandals. → Old car tires are recycled to make shoes and sandals. 

7. The boy is playing chess with you. He is my uncle.

→ The boy, who is my uncle, is playing chess with you.

8. Keeping the environment clean is very important.

→ It’s very important to keep the environment clean.